Organic Electronic Element Using Phosphorescent Host Compound Mixture
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Solution Overview
Problem
Current organic electric elements face challenges in achieving high luminous efficiency, color purity, and long lifespan due to intermolecular interactions and energy level imbalances in the organic material layers, particularly in large portable displays where power consumption is a critical factor.
Innovation Solution
The use of a specific compound mixture in the organic material layer, represented by Formulas 1 and 2, which serves as a phosphorescent host material to optimize energy levels and charge balance, thereby reducing driving voltage and enhancing luminous efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitting material is used, then the device structure is simple, but the maximum luminescence wavelength shifts to longer wavelength and color purity deteriorates
Solution Approach 1:
The patent employs a host/dopant composite material system where a host material and dopant material are combined in the light emitting layer. The host material provides the primary light emission while the dopant material, present in smaller amounts, emits at a different wavelength. This composite approach enables precise control over the spectral output, achieving high color purity by selecting appropriate host and dopant combinations that emit at desired wavelengths with minimal overlap.
2Productivity
If efficiency is increased, then driving voltage is lowered, but crystallization of organic material due to Joule heating increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: selecting host and dopant materials with appropriate energy levels, adjusting the dopant concentration to 1-20 wt%, and controlling the HOMO/LUMO energy level alignments. These parameter changes enable efficient energy transfer from host to dopant while managing the thermal characteristics of the system, reducing Joule heating effects and preventing crystallization of the organic materials during operation.
3Productivity
If a dopant with smaller energy band gap is mixed in the light emitting layer, then luminous efficiency increases through energy transfer, but the host wavelength shifts to the dopant wavelength band
Solution Approach 1:
The host material acts as an intermediary that absorbs energy at its characteristic wavelength and transfers it to the dopant material. By carefully selecting the host material with an appropriate energy level structure, the system achieves efficient energy transfer to the dopant while the host's absorption characteristics determine the overall spectral output. This intermediary mechanism allows precise control over the emitted light wavelength by selecting different host-dopant combinations.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively lowers driving voltage, improves luminous efficiency, and extends the lifespan of the organic electric element by optimizing the energy levels and interfacial properties within the organic material layers.
Implementation Method 1
An organic light emitting phenomenon refers to a phenomenon in which electric energy is converted into light energy of an organic material
Implementation Method 2
a phosphorescent material derived from excited triplet states of electron according to its light emitting mechanism
Data Source
AI summary
Provided are an organic electric element including an anode, a cathode, and an organic material layer formed between the anode and the cathode, and electronic device thereof, and by including the compounds of Formulas 1 and 2 in the organic material layer, the driving voltage of the organic electric element can be lowered, and the luminous efficiency and life time of the organic electric element can be improved.